James stewart



(No Model.)

J. STEWART.

ELECTRIC LAMP ADAPTER.

No. 421,630. Patented Feb. 18, 1890.

Fit:

WITNESSES ATTORNEYS.

N. PHERS. PhnlwLMhogg-npher. Wadwingion. 0,0.

UNITED STATES ATENT, OFFICE.

JAMES STEWART, OF NEIV YORK, N. Y., ASSIGNOR OF ONE-HALF TO EDMUND O.STANTON, OF SAME PLACE.

ELECTRIC-LAMP ADAPTER.

SPECIFICATION forming part of Letters Patent No. 421,630, dated February18, 1890. Application filed August 4, 1888. Renewed January 20, 1890.Serial No. 337,502. (No model.).

To all whom it may concern:

Be it known that I, JAMES STEWART, of the city, county, and State of NewYork, have invented a new and Improved Electric-Lamp Coupling orAdapter, of which the following is a specification, reference being hadto the annexed drawings, forming a part thereof, in which- Figure 1 isan inverted plan view of my improved la'mp couplingor adapter. Fig. 2 isa diametrical section taken on line a: 00 in Fig. 1. Fig. 3 is adiametrical section taken on line y y in Fig. 1. Figs. 4, 5, and 6 showthe device modified to adapt it to different kinds of lamps; and Fig. 7is a perspective view of the coupling or adapter, showingits applicationto a lamp.

Similar letters of reference indicate corresponding parts in all theviews.

The object of my invention is to construct a device by which lamps ofdifferent kinds may be adapted to lamp-sockets not made for theirreception.

My invention consists in the construction and arrangement of parts, aswill be hereinafter fully described and claimed.

The button A, which is of insulating material, is provided with ametallic band B around its periphery, which is screw-threaded to fit itto the class of lamp-sockets provided with a corresponding internalscrew-thread. In the center of the button is inserted a centrally-boredstud 0, provided with an arm D,

is inserted a metallic contact-ring G. In the face of the button inwhich the arm D is inserted, and upon the opposite side of the knob E,is embedded a plate H, which forms an electrical contact with themetallic band B,

. and which is held in place bya screw 1, passing through the button andentering the ring G, the screw also forming an electrical contactbetween the said ring and the plate H.

in some forms of lamp-sockets. sockets not provided with an internalscrew= 'In the arm D is inserted a screw J, which is required for makingan electrical contact In lampthread, but furnished withrectangularriotches forming a part of a bayonet-joint, a coupling oradapter provided with screws or studs a, projecting fromdiametrically-opposite sides thereof, is required.

My improved coupling or adapter is capable of forming an electricalconnection-between lamps having a central screw-socket, as shown in Fig.7, andany form of lampsocket in common use. The under surface of thelamp coupling or adapter is capable of forming a connection with asocket provided with springs for engaging the knob E, the other contactbeing made with the band B or the screw I; or the knob E maybe removedand the contact then be made with the screws I J.

The contact between a lamp and the upper surface of the adapter may beeffected by means of the screw-stud C and ring G.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent- 1. An electric-lampadapter formed of a button of insulating material, a screw-threadedperipheral band surrounding the'said button, a ring embedded in the saidbutton and connected electrically with theband, and a central studprovided with a contact-piece, substantially as and for the purposespecified.

2. The combination, with the button A of insulating material, of thescrew-threaded band B, encircling the button, the metallic ring G,embedded in the said button and connected electrically with the band B,the central screw-threaded stud F, and the stud E, inserted in the endof the stud F, substantially as and for the purpose specified.

JAMES STEWART.

lVitnesses:

. O. SEDGWICK,

CLARK.

